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Definition
Key agreement is one form of Key Establishment in which two or more users jointly contribute information that is used to establish a shared, symmetric key.
Background
The ability for two users to establish a shared, symmetric key over an insecure communication channel, despite having “not met previously” (more importantly, the users don’t already have shared key material) was first proposed by Diffie and Hellman in 1976. Till that time, two users would either need to have shared key material between them already, or rely upon a Key Distribution Center.
Theory
Key agreement is one form of Key Establishment. Unlike Key Transport in which one user securely sends (transports) a key to another user, users participating in a key agreement protocol jointly and equally contribute to the resultant key value. Key agreement...
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Diffie W, Hellman ME (1976) New directions in cryptography. IEEE Trans Info Theory IT-22(6):644–654
Menezes A, van Oorschot PC, Vanstone SA (1996) Handbook of applied cryptography. CRC Press, Boca Raton, FL
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© 2011 Springer Science+Business Media, LLC
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Just, M. (2011). Key Agreement. In: van Tilborg, H.C.A., Jajodia, S. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5906-5_82
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DOI: https://doi.org/10.1007/978-1-4419-5906-5_82
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4419-5905-8
Online ISBN: 978-1-4419-5906-5
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